How to enable DEBUG in OVN Controller

Solution Verified - Updated -

Environment

  • Red Hat OpenStack Platform (RHOSP) 16.2
  • Red Hat OpenStack Platform (RHOSP) 17.0
  • Red Hat OpenStack Platform (RHOSP) 17.1

Issue

  • In a deployment that uses the OVN mechanism driver, how can I enable DEBUG in OVN Controller?

Resolution

You can choose from these alternate methods for enabling DEBUG in OVN Controller:

Method 1: Use Ansible playbooks. This approach was added to make the task easier. In most cases it provides better results.

Method 2: Use a manual procedure. This is the approach first published with this article. Use it if the Automated with Ansible approach is not appropriate for your situation.

METHOD 1: Use Ansible playbooks to enable DEBUG in OVN controller

  1. Get the playbook:

    [stack@director ~]$ mkdir -p ~/playbooks && curl -so ~/playbooks/ovn-debug.yaml https://raw.githubusercontent.com/enothen/rhosp-tools/refs/heads/main/playbooks/ovn-debug.yaml
[stack@director ~]$

  2. In RHOSP 16.2, create an inventory file (if not created yet). This task is not required in RHOSP 17.1, because a default inventory can be used.

    [stack@director.test.lab ~]$ source stackrc 
(undercloud) [stack@director.test.lab ~]$ tripleo-ansible-inventory --static-yaml-inventory ~/inventory.yaml
(undercloud) [stack@director.test.lab ~]$

  3. Run the playbook using either the inventory created in the previous step, or in case of RHOSP 17.1, the default inventory. Use -l to limit nodes where to enable debug. Otherwise, the playbook will enable debug in all overcloud nodes (except nodes with role CephStorage):

    (undercloud) [stack@director ~]$ ansible-playbook -i /home/stack/overcloud-deploy/overcloud/tripleo-ansible-inventory.yaml playbooks/ovn-debug.yaml -l overcloud-controller-0
[WARNING]: Could not match supplied host pattern, ignoring: CephStorage

PLAY [This playbook enables/disables debug in ovn_controller and ovs-vswitchd] ***************************************

TASK [Enable/Disable debug in ovn_controller modules] ****************************************************************
changed: [overcloud-controller-0] => (item=binding)
changed: [overcloud-controller-0] => (item=chassis)
changed: [overcloud-controller-0] => (item=encaps)
changed: [overcloud-controller-0] => (item=if_status)
changed: [overcloud-controller-0] => (item=inc_proc_eng)
changed: [overcloud-controller-0] => (item=lport)
changed: [overcloud-controller-0] => (item=main)
changed: [overcloud-controller-0] => (item=ofctrl)
changed: [overcloud-controller-0] => (item=physical)
changed: [overcloud-controller-0] => (item=pinctrl)

TASK [Enable/Disable debug in ovs-vswitchd modules] ******************************************************************
changed: [overcloud-controller-0] => (item=bridge)
changed: [overcloud-controller-0] => (item=flow)
changed: [overcloud-controller-0] => (item=vswitchd)

PLAY RECAP ***********************************************************************************************************
overcloud-controller-0     : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

  4. Verify changes running the playbook again, this time with --tags display:

    (undercloud) [stack@director ~]$ ansible-playbook -i /home/stack/overcloud-deploy/overcloud/tripleo-ansible-inventory.yaml playbooks/ovn-debug.yaml -l overcloud-controller-0 --tags display
[WARNING]: Could not match supplied host pattern, ignoring: CephStorage

PLAY [This playbook enables/disables debug in ovn_controller and ovs-vswitchd] ***************************************

TASK [Get ovn modules in debug] **************************************************************************************
changed: [overcloud-controller-0]

TASK [Display ovn modules in debug] **********************************************************************************
ok: [overcloud-controller-0] => {
    "ovn_output.stdout_lines": [
        "                 console    syslog    file",
        "                 -------    ------    ------",
        "binding           INFO       INFO        DBG",
        "chassis           INFO       INFO        DBG",
        "encaps            INFO       INFO        DBG",
        "if_status         INFO       INFO        DBG",
        "inc_proc_eng      INFO       INFO        DBG",
        "lport             INFO       INFO        DBG",
        "main              INFO       INFO        DBG",
        "ofctrl            INFO       INFO        DBG",
        "physical          INFO       INFO        DBG",
        "pinctrl           INFO       INFO        DBG"
    ]
}

TASK [Get ovs modules in debug] **************************************************************************************
changed: [overcloud-controller-0]

TASK [Display ovs modules in debug] **********************************************************************************
ok: [overcloud-controller-0] => {
    "ovs_output.stdout_lines": [
        "                 console    syslog    file",
        "                 -------    ------    ------",
        "bridge             OFF        ERR        DBG",
        "flow               OFF        ERR        DBG",
        "vswitchd           OFF        ERR        DBG"
    ]
}

PLAY RECAP ***********************************************************************************************************
overcloud-controller-0     : ok=4    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

  5. When troubleshooting is complete, disable debug by reverting the modules back to the default level of “INFO”:

    (undercloud) [stack@director ~]$ ansible-playbook -i /home/stack/overcloud-deploy/overcloud/tripleo-ansible-inventory.yaml playbooks/ovn-debug.yaml -l overcloud-controller-0 -e 'mode=INFO'
[WARNING]: Could not match supplied host pattern, ignoring: CephStorage

PLAY [This playbook enables/disables debug in ovn_controller and ovs-vswitchd] ***************************************

TASK [Enable/Disable debug in ovn_controller modules] ****************************************************************
changed: [overcloud-controller-0] => (item=binding)
changed: [overcloud-controller-0] => (item=chassis)
changed: [overcloud-controller-0] => (item=encaps)
changed: [overcloud-controller-0] => (item=if_status)
changed: [overcloud-controller-0] => (item=inc_proc_eng)
changed: [overcloud-controller-0] => (item=lport)
changed: [overcloud-controller-0] => (item=main)
changed: [overcloud-controller-0] => (item=ofctrl)
changed: [overcloud-controller-0] => (item=physical)
changed: [overcloud-controller-0] => (item=pinctrl)

TASK [Enable/Disable debug in ovs-vswitchd modules] ******************************************************************
changed: [overcloud-controller-0] => (item=bridge)
changed: [overcloud-controller-0] => (item=flow)
changed: [overcloud-controller-0] => (item=vswitchd)

PLAY RECAP ***********************************************************************************************************
overcloud-controller-0     : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

EXAMPLE: customizing the list of modules through Ansible extra-vars

  • Setting: It is possible to customize the list of modules for which to change the output level to debug, using Ansible extra vars ovn_modules and ovs_modules. Note that both of them need to be defined as lists. For example:

    [stack@director.test.lab ~]$ ansible-playbook -i inventory.yaml playbooks/ovn-debug.yaml -l overcloud-controller-0 -e '{"ovn_modules": [binding, chassis, encaps], "ovs_modules": [bridge, vswitchd] }'

PLAY [This playbook enables/disables debug in ovn_controller containers] *********************************************************
Saturday 01 February 2025  12:35:25 +0100 (0:00:00.063)       0:00:00.063 ***** 
Saturday 01 February 2025  12:35:25 +0100 (0:00:00.062)       0:00:00.062 ***** 

TASK [Enable/Disable debug in ovn_controller modules] ****************************************************************************
changed: [overcloud-controller-0] => (item=binding)
changed: [overcloud-controller-0] => (item=chassis)
changed: [overcloud-controller-0] => (item=encaps)
Saturday 01 February 2025  12:35:27 +0100 (0:00:02.385)       0:00:02.448 ***** 
Saturday 01 February 2025  12:35:27 +0100 (0:00:02.386)       0:00:02.448 ***** 

TASK [Enable/Disable debug in ovs-vswitchd modules] ******************************************************************************
changed: [overcloud-controller-0] => (item=bridge)
changed: [overcloud-controller-0] => (item=vswitchd)

PLAY RECAP ***********************************************************************************************************************
overcloud-controller-0     : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

Saturday 01 February 2025  12:35:28 +0100 (0:00:00.740)       0:00:03.189 ***** 
=============================================================================== 
command ----------------------------------------------------------------- 3.13s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
total ------------------------------------------------------------------- 3.13s
Saturday 01 February 2025  12:35:28 +0100 (0:00:00.740)       0:00:03.189 ***** 
=============================================================================== 
Enable/Disable debug in ovn_controller modules ---------------------------------------------------------------------------- 2.39s
Enable/Disable debug in ovs-vswitchd modules ------------------------------------------------------------------------------ 0.74s
Playbook run took 0 days, 0 hours, 0 minutes, 3 seconds

  • Displaying:

    [stack@director.test.lab ~]$ ansible-playbook -i inventory.yaml playbooks/ovn-debug.yaml -l overcloud-controller-0 --tags display

PLAY [This playbook enables/disables debug in ovn_controller containers] *********************************************************
Saturday 01 February 2025  12:36:02 +0100 (0:00:00.064)       0:00:00.064 ***** 
Saturday 01 February 2025  12:36:02 +0100 (0:00:00.064)       0:00:00.064 ***** 

TASK [Get ovn modules in debug] **************************************************************************************************
changed: [overcloud-controller-0]
Saturday 01 February 2025  12:36:03 +0100 (0:00:01.510)       0:00:01.575 ***** 
Saturday 01 February 2025  12:36:03 +0100 (0:00:01.510)       0:00:01.575 ***** 

TASK [Display ovn modules in debug] **********************************************************************************************
ok: [overcloud-controller-0] => {
    "ovn_output.stdout_lines": [
        "                 console    syslog    file",
        "                 -------    ------    ------",
        "binding           INFO       INFO        DBG",
        "chassis           INFO       INFO        DBG",
        "encaps            INFO       INFO        DBG"
    ]
}
Saturday 01 February 2025  12:36:03 +0100 (0:00:00.123)       0:00:01.698 ***** 
Saturday 01 February 2025  12:36:03 +0100 (0:00:00.123)       0:00:01.698 ***** 

TASK [Get ovs modules in debug] **************************************************************************************************
changed: [overcloud-controller-0]
Saturday 01 February 2025  12:36:04 +0100 (0:00:00.392)       0:00:02.091 ***** 
Saturday 01 February 2025  12:36:04 +0100 (0:00:00.392)       0:00:02.091 ***** 

TASK [Display ovs modules in debug] **********************************************************************************************
ok: [overcloud-controller-0] => {
    "ovs_output.stdout_lines": [
        "                 console    syslog    file",
        "                 -------    ------    ------",
        "bridge             OFF        ERR        DBG",
        "vswitchd           OFF        ERR        DBG"
    ]
}

PLAY RECAP ***********************************************************************************************************************
overcloud-controller-0     : ok=4    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

Saturday 01 February 2025  12:36:04 +0100 (0:00:00.119)       0:00:02.211 ***** 
=============================================================================== 
shell ------------------------------------------------------------------- 1.90s
debug ------------------------------------------------------------------- 0.24s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
total ------------------------------------------------------------------- 2.15s
Saturday 01 February 2025  12:36:04 +0100 (0:00:00.119)       0:00:02.210 ***** 
=============================================================================== 
Get ovn modules in debug -------------------------------------------------------------------------------------------------- 1.51s
Get ovs modules in debug -------------------------------------------------------------------------------------------------- 0.39s
Display ovn modules in debug ---------------------------------------------------------------------------------------------- 0.12s
Display ovs modules in debug ---------------------------------------------------------------------------------------------- 0.12s
Playbook run took 0 days, 0 hours, 0 minutes, 2 seconds

  • Rolling back: Use the ansible extra var mode=INFO to rollback the changes from DBG to INFO (default). If you previously added a list of custom ovn_modules, also include the same list when rolling back:

    [stack@director.test.lab ~]$ ansible-playbook -i inventory.yaml playbooks/ovn-debug.yaml -l overcloud-controller-0 -e '{"ovn_modules": [binding, chassis, encaps], "ovs_modules": [bridge, vswitchd], mode="INFO" }'

PLAY [This playbook enables/disables debug in ovn_controller containers] *********************************************************
Saturday 01 February 2025  12:36:40 +0100 (0:00:00.071)       0:00:00.071 ***** 
Saturday 01 February 2025  12:36:40 +0100 (0:00:00.070)       0:00:00.070 ***** 

TASK [Enable/Disable debug in ovn_controller modules] ****************************************************************************
changed: [overcloud-controller-0] => (item=binding)
changed: [overcloud-controller-0] => (item=chassis)
changed: [overcloud-controller-0] => (item=encaps)
Saturday 01 February 2025  12:36:42 +0100 (0:00:01.942)       0:00:02.013 ***** 
Saturday 01 February 2025  12:36:42 +0100 (0:00:01.942)       0:00:02.012 ***** 

TASK [Enable/Disable debug in ovs-vswitchd modules] ******************************************************************************
changed: [overcloud-controller-0] => (item=bridge)
changed: [overcloud-controller-0] => (item=vswitchd)

PLAY RECAP ***********************************************************************************************************************
overcloud-controller-0     : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

Saturday 01 February 2025  12:36:43 +0100 (0:00:00.627)       0:00:02.640 ***** 
=============================================================================== 
command ----------------------------------------------------------------- 2.57s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
total ------------------------------------------------------------------- 2.57s
Saturday 01 February 2025  12:36:43 +0100 (0:00:00.627)       0:00:02.640 ***** 
=============================================================================== 
Enable/Disable debug in ovn_controller modules ---------------------------------------------------------------------------- 1.94s
Enable/Disable debug in ovs-vswitchd modules ------------------------------------------------------------------------------ 0.63s
Playbook run took 0 days, 0 hours, 0 minutes, 2 seconds

METHOD 2: Use manual procedure to enable DEBUG in OVN controller
- The ovn-controller service runs in a container, so you must set the DEBUG option inside the container.

  • Verify the status of tripleo_ovn_controller service is Active:

    # systemctl is-active tripleo_ovn_controller
active

  • Inside the container, use ovn-appctl to verify list-commands offered for ovn-controller. ovn-appctl is a tool for communicating with running OVN services such as ovn-controller and ovn-northd. Note that in the output, the set of commands that begin with vlog are used to configure the logging mechanism of OVN services.

    # podman exec -it -u root ovn_controller ovn-appctl list-commands
The available commands are:
  connection-status       
  coverage/read-counter   COUNTER
  coverage/show           
  ct-zone-list            
  debug/delay-nb-cfg-report SECONDS
  debug/dump-lflow-conj-ids 
  debug/dump-local-bindings 
  debug/pause             
  debug/resume            
  debug/status            
  dpif-netlink/dispatch-mode 
  exit                    
  flush-lflow-cache       [deprecated]
  group-table-list        
  inc-engine/clear-stats  
  inc-engine/recompute    
  inc-engine/show-stats   
  inject-pkt              MICROFLOW
  lflow-cache/flush       
  lflow-cache/show-stats  
  list-commands           
  memory/show             
  meter-table-list        
  recompute               [deprecated]
  sb-cluster-state-reset  
  stopwatch/reset         [NAME]
  stopwatch/show          [NAME]
  tnl/egress_port_range   min max
  version                 
  vlog/close              
  vlog/disable-rate-limit [module]...
  vlog/enable-rate-limit  [module]...
  vlog/list               
  vlog/list-pattern       
  vlog/reopen             
  vlog/set                {spec | PATTERN:destination:pattern}

  • Verify the logging pattern for ovn-controller.
    Note that each 'ovn-controller` module has its own logging configuration. You can enable logging for all modules or for specific modules. Generally it is better to enable logging for specific modules, because logging for all modules makes it difficult to find the information you need. Engineering can help you decide which module logs to enable for a specific case or problem.

    # podman exec -it -u root ovn_controller ovn-appctl vlog/list-pattern
         prefix                            format
         ------                            ------
SYSLOG   <%B> %D{%h %e %T} %E %A:          ovs|%05N|%c%T|%p|%m
CONSOLE  none                              %D{%Y-%m-%dT%H:%M:%SZ}|%05N|%c%T|%p|%m
FILE     none                              %D{%Y-%m-%dT%H:%M:%S.###Z}|%05N|%c%T|%p|%m

  • Review the list of ovn-controller modules that are available for configuration:

    # podman exec -it -u root ovn_controller ovn-appctl vlog/list
                 console    syslog    file
                 -------    ------    ------
acl_log           INFO       INFO       INFO
actions           INFO       INFO       INFO
backtrace         INFO       INFO       INFO
binding           INFO       INFO       INFO
bundle            INFO       INFO       INFO
chassis           INFO       INFO       INFO
command_line      INFO       INFO       INFO
conntrack         INFO       INFO       INFO
conntrack_tp      INFO       INFO       INFO
coverage          INFO       INFO       INFO
ct_dpif           INFO       INFO       INFO
daemon            INFO       INFO       INFO
daemon_unix       INFO       INFO       INFO
dns_resolve       INFO       INFO       INFO
dpdk              INFO       INFO       INFO
dpif              INFO       INFO       INFO
dpif_lookup_autovalidator  INFO       INFO       INFO
dpif_lookup_generic  INFO       INFO       INFO
dpif_mfex_extract_study  INFO       INFO       INFO
dpif_netdev       INFO       INFO       INFO
dpif_netdev_extract  INFO       INFO       INFO
dpif_netdev_impl  INFO       INFO       INFO
dpif_netdev_lookup  INFO       INFO       INFO
dpif_netlink      INFO       INFO       INFO
dpif_netlink_rtnl  INFO       INFO       INFO
encaps            INFO       INFO       INFO
entropy           INFO       INFO       INFO
expr              INFO       INFO       INFO
extend_table      INFO       INFO       INFO
fatal_signal      INFO       INFO       INFO
features          INFO       INFO       INFO
flow              INFO       INFO       INFO
ha_chassis        INFO       INFO       INFO
hmap              INFO       INFO       INFO
if_status         INFO       INFO       INFO
inc_proc_eng      INFO       INFO       INFO
ipf               INFO       INFO       INFO
jsonrpc           INFO       INFO       INFO
lb                INFO       INFO       INFO
ldata             INFO       INFO       INFO
lflow             INFO       INFO       INFO
lflow_cache       INFO       INFO       INFO
lockfile          INFO       INFO       INFO
lport             INFO       INFO       INFO
mac_learn         INFO       INFO       INFO
main              INFO       INFO       INFO
memory            INFO       INFO       INFO
meta_flow         INFO       INFO       INFO
native_tnl        INFO       INFO       INFO
netdev            INFO       INFO       INFO
netdev_linux      INFO       INFO       INFO
netdev_offload    INFO       INFO       INFO
netdev_offload_tc  INFO       INFO       INFO
netdev_vport      INFO       INFO       INFO
netlink           INFO       INFO       INFO
netlink_conntrack  INFO       INFO       INFO
netlink_notifier  INFO       INFO       INFO
netlink_socket    INFO       INFO       INFO
nx_match          INFO       INFO       INFO
odp_execute       INFO       INFO       INFO
odp_util          INFO       INFO       INFO
ofctrl            INFO       INFO       INFO
ofp_actions       INFO       INFO       INFO
ofp_bundle        INFO       INFO       INFO
ofp_connection    INFO       INFO       INFO
ofp_errors        INFO       INFO       INFO
ofp_flow          INFO       INFO       INFO
ofp_group         INFO       INFO       INFO
ofp_match         INFO       INFO       INFO
ofp_meter         INFO       INFO       INFO
ofp_monitor       INFO       INFO       INFO
ofp_msgs          INFO       INFO       INFO
ofp_packet        INFO       INFO       INFO
ofp_port          INFO       INFO       INFO
ofp_protocol      INFO       INFO       INFO
ofp_queue         INFO       INFO       INFO
ofp_table         INFO       INFO       INFO
ofp_util          INFO       INFO       INFO
ovn_bfd           INFO       INFO       INFO
ovn_util          INFO       INFO       INFO
ovs_numa          INFO       INFO       INFO
ovs_rcu           INFO       INFO       INFO
ovs_replay        INFO       INFO       INFO
ovs_router        INFO       INFO       INFO
ovs_thread        INFO       INFO       INFO
ovsdb_cs          INFO       INFO       INFO
ovsdb_error       INFO       INFO       INFO
ovsdb_idl         INFO       INFO       INFO
ovsport           INFO       INFO       INFO
ox_stat           INFO       INFO       INFO
patch             INFO       INFO       INFO
physical          INFO       INFO       INFO
pinctrl           INFO       INFO       INFO
pmd_perf          INFO       INFO       INFO
poll_loop         INFO       INFO       INFO
process           INFO       INFO       INFO
rconn             INFO       INFO       INFO
reconnect         INFO       INFO       INFO
route_table       INFO       INFO       INFO
signals           INFO       INFO       INFO
socket_util       INFO       INFO       INFO
socket_util_unix  INFO       INFO       INFO
stopwatch         INFO       INFO       INFO
stream            INFO       INFO       INFO
stream_fd         INFO       INFO       INFO
stream_replay     INFO       INFO       INFO
stream_ssl        INFO       INFO       INFO
stream_tcp        INFO       INFO       INFO
stream_unix       INFO       INFO       INFO
svec              INFO       INFO       INFO
tc                INFO       INFO       INFO
timeval           INFO       INFO       INFO
unixctl           INFO       INFO       INFO
userspace_tso     INFO       INFO       INFO
util              INFO       INFO       INFO
uuid              INFO       INFO       INFO
vconn             INFO       INFO       INFO
vconn_stream      INFO       INFO       INFO
vif_plug          INFO       INFO       INFO
vif_plug_dummy    INFO       INFO       INFO
vif_plug_provider  INFO       INFO       INFO
vlog              INFO       INFO       INFO

  • Use the following ovn-appctl syntax to customize vlog:

    ovn-appctl vlog/set module:facility:level

    Values for facility include kern, user, mail, daemon, auth, syslog, lpr, news, uucp, clock, ftp, ntp, audit, alert, clock2, local0, local1, local2, local3, local4, local5, local6 and local7.
    Values for level include: off, emer, err, warn, info, dbg. For more information, see https://man7.org/linux/man-pages/man8/ovn-appctl.8.html.

  • Example 1: verify OVN module chassis.

    # podman exec -it -u root ovn_controller ovn-appctl vlog/list | grep chassis
chassis           INFO       INFO       INFO

  • Example 2: enable debug for OVN chassis module. Before using this command, note the previous settings so you can restore them.
    Note that this is just a sample command. Each case or problem might require looking at a different set of modules.
    Note that changes to logging configurations are not persistent across service restarts. They are reset after a service restart.

    podman exec -it -u root ovn_controller ovn-appctl vlog/set chassis:file:dbg

  • Review the debug log from the following /var/log/containers/openvswitch/ovn-controller.log location.

    2022-08-22T08:38:49.845Z|17330|inc_proc_eng|DBG|controller/ovn-controller.c:975: node: SB_chassis, old_state Stale, new_state Unchanged
2022-08-22T08:38:49.845Z|17368|inc_proc_eng|DBG|lib/inc-proc-eng.c:323: node: SB_chassis, old_state Unchanged, new_state Stale
2022-08-22T08:38:49.845Z|17399|inc_proc_eng|DBG|controller/ovn-controller.c:975: node: SB_chassis, old_state Stale, new_state Unchanged
2022-08-22T08:38:49.974Z|17433|inc_proc_eng|DBG|lib/inc-proc-eng.c:323: node: SB_chassis, old_state Unchanged, new_state Stale
2022-08-22T08:38:49.974Z|17464|inc_proc_eng|DBG|controller/ovn-controller.c:975: node: SB_chassis, old_state Stale, new_state Unchanged

  • Example of how to disable debug for OVN chassis module. Note: to prevent excessive logging and storage of debug messages, you should disable the debug mode when you are done collecting data.

    podman exec -it -u root ovn_controller ovn-appctl vlog/set chassis:file:info

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